The establishment of the Kingdom of God will involve the re-gathering of the Jews to the land of Palestine. God says in Isaiah 43:21:
”this people have I formed for myself; they shall show forth my praise.”
Jesus said that
“salvation is of the Jews.”
The kingdom to be established has its roots in God’s dealings with the Jews in the past so that it is described as the Kingdom of Israel restored.
There are many prophecies that speak about the restoration. Here is one from Ezekiel 37:21:
“Thus saith the Lord GOD; Behold, I will take the children of Israel from among the nations, whither they be gone, and will gather them on every side, and bring them into their own land: And I will make them one nation in the land upon the mountains of Israel; and one king shall be king to them all”
Isa 11:11,12. Isa 51:3. Jer. 31:10,27,28. Ezekiel 36:34-36.